Hey all. Finally know what I will put in my tank (unless i hear a good argument)

A LFS has double red apisto for $10/ea. Right now I plan to get my sterbai or similar cory at a local auction 2/17/13. So onto my questions

1. Would it be ok to add apistos before i add the cory?

2. I've seen mixed answers on whether the apistos should be in pairs or harems... what do you all think?

3. I have probably 3 hiding holes from the driftwood, along with plants etc, is this good enough, or should i add some more types of caves